19889216 has 28 divisors (see below), whose sum is σ = 39794688. Its totient is φ = 9862272.

The previous prime is 19889213. The next prime is 19889237. The reversal of 19889216 is 61298891.

19889216 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (19889213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6905 + ... + 9351.

Almost surely, 2^19889216 is an apocalyptic number.

19889216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19889216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19897344).

19889216 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19889216 is a wasteful number, since it uses less digits than its factorization.

19889216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586 (or 2576 counting only the distinct ones).

The product of its digits is 62208, while the sum is 44.

The square root of 19889216 is about 4459.7327274176. The cubic root of 19889216 is about 270.9396433351.

The spelling of 19889216 in words is "nineteen million, eight hundred eighty-nine thousand, two hundred sixteen".